public void NotCallUpdate_WhenObserverNotAttachedToSubject()
{
// Arrange
var subject = new SpecialsSubject();
var mockObserver = new Mock <IObserver>();
// Act
subject.SubjectState = "Footwear Sale";
subject.Notify();
// Assert
mockObserver.Verify(observer => observer.Update(subject), Times.Never());
}
public void UpdateObserverOnce_WhenSubjectHasSpecials()
{
// Arrange
var subject = new SpecialsSubject();
var mockObserver = new Mock <IObserver>();
// Act
subject.Attach(mockObserver.Object);
subject.SubjectState = "Footwear Sale";
subject.Notify();
// Assert
mockObserver.Verify(observer => observer.Update(subject), Times.Once());
}
